iOS App中添加半透明新手指引

/**
 *  新手指引
 */
- (void)newUserGuide{
    // 这里创建指引在这个视图在window上
    CGRect frame = [UIScreen mainScreen].bounds;
    UIView * bgView = [[UIView alloc] initWithFrame:frame];
    
    UIColor *color = [UIColor blackColor];
    bgView.backgroundColor = [color colorWithAlphaComponent:0.1];
    
    UITapGestureRecognizer * tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(sureTapClick:)];
    [bgView addGestureRecognizer:tap];
    [[UIApplication sharedApplication].keyWindow addSubview:bgView];
    
    //create path 重点来了（**这里需要添加第一个路径）
    UIBezierPath *path = [UIBezierPath bezierPathWithRect:frame];
    // 这里添加第二个路径 （这个是圆）
    [path appendPath:[UIBezierPath bezierPathWithArcCenter:CGPointMake(frame.size.width - 30, 42) radius:30 startAngle:0 endAngle:2*M_PI clockwise:NO]];
    // 这里添加第二个路径 （这个是矩形）
//    [path appendPath:[[UIBezierPath bezierPathWithRoundedRect:CGRectMake(frame.size.width/2.0-1, 234, frame.size.width/2.0+1, 55) cornerRadius:5] bezierPathByReversingPath]];
    
    CAShapeLayer *shapeLayer = [CAShapeLayer layer];
    shapeLayer.path = path.CGPath;
//    shapeLayer.strokeColor = [UIColor blueColor].CGColor;
    [bgView.layer setMask:shapeLayer];
    UIImageView * imageView = [[UIImageView alloc]initWithFrame:CGRectMake(frame.size.width -300,72,270, 137)];
    //imageView.image = [UIImage imageNamed:@"CouponBoard_guid"];
    imageView.backgroundColor = [UIColor redColor];
    [bgView addSubview:imageView];
}

/**
 *   新手指引确定
 */
- (void)sureTapClick:(UITapGestureRecognizer *)tap
{
    UIView * view = tap.view;
    [view removeFromSuperview];
    [view removeGestureRecognizer:tap];
    [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"firstCouponBoard_iPhone"];
}

来自:http://www.jianshu.com/p/00d4fe5a3c1a